Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 724 insertions, 0 deletions

diff --git a/drivers/net/isa-skeleton.c b/drivers/net/isa-skeleton.c
new file mode 100644
index 00000000000..50bebb55e9e
--- /dev/null
+++ b/drivers/net/isa-skeleton.c
@@ -0,0 +1,724 @@
+/* isa-skeleton.c: A network driver outline for linux.
+ *
+ *	Written 1993-94 by Donald Becker.
+ *
+ *	Copyright 1993 United States Government as represented by the
+ *	Director, National Security Agency.
+ *
+ *	This software may be used and distributed according to the terms
+ *	of the GNU General Public License, incorporated herein by reference.
+ *
+ *	The author may be reached as becker@scyld.com, or C/O
+ *	Scyld Computing Corporation
+ *	410 Severn Ave., Suite 210
+ *	Annapolis MD 21403
+ *
+ *	This file is an outline for writing a network device driver for the
+ *	the Linux operating system.
+ *
+ *	To write (or understand) a driver, have a look at the "loopback.c" file to
+ *	get a feel of what is going on, and then use the code below as a skeleton
+ *	for the new driver.
+ *
+ */
+
+static const char *version =
+	"isa-skeleton.c:v1.51 9/24/94 Donald Becker (becker@cesdis.gsfc.nasa.gov)\n";
+
+/*
+ *  Sources:
+ *	List your sources of programming information to document that
+ *	the driver is your own creation, and give due credit to others
+ *	that contributed to the work. Remember that GNU project code
+ *	cannot use proprietary or trade secret information. Interface
+ *	definitions are generally considered non-copyrightable to the
+ *	extent that the same names and structures must be used to be
+ *	compatible.
+ *
+ *	Finally, keep in mind that the Linux kernel is has an API, not
+ *	ABI. Proprietary object-code-only distributions are not permitted
+ *	under the GPL.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/fcntl.h>
+#include <linux/interrupt.h>
+#include <linux/ioport.h>
+#include <linux/in.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+#include <linux/spinlock.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/skbuff.h>
+#include <linux/bitops.h>
+
+#include <asm/system.h>
+#include <asm/io.h>
+#include <asm/dma.h>
+
+/*
+ * The name of the card. Is used for messages and in the requests for
+ * io regions, irqs and dma channels
+ */
+static const char* cardname = "netcard";
+
+/* First, a few definitions that the brave might change. */
+
+/* A zero-terminated list of I/O addresses to be probed. */
+static unsigned int netcard_portlist[] __initdata =
+   { 0x200, 0x240, 0x280, 0x2C0, 0x300, 0x320, 0x340, 0};
+
+/* use 0 for production, 1 for verification, >2 for debug */
+#ifndef NET_DEBUG
+#define NET_DEBUG 2
+#endif
+static unsigned int net_debug = NET_DEBUG;
+
+/* The number of low I/O ports used by the ethercard. */
+#define NETCARD_IO_EXTENT	32
+
+#define MY_TX_TIMEOUT  ((400*HZ)/1000)
+
+/* Information that need to be kept for each board. */
+struct net_local {
+	struct net_device_stats stats;
+	long open_time;			/* Useless example local info. */
+
+	/* Tx control lock.  This protects the transmit buffer ring
+	 * state along with the "tx full" state of the driver.  This
+	 * means all netif_queue flow control actions are protected
+	 * by this lock as well.
+	 */
+	spinlock_t lock;
+};
+
+/* The station (ethernet) address prefix, used for IDing the board. */
+#define SA_ADDR0 0x00
+#define SA_ADDR1 0x42
+#define SA_ADDR2 0x65
+
+/* Index to functions, as function prototypes. */
+
+static int	netcard_probe1(struct net_device *dev, int ioaddr);
+static int	net_open(struct net_device *dev);
+static int	net_send_packet(struct sk_buff *skb, struct net_device *dev);
+static irqreturn_t net_interrupt(int irq, void *dev_id, struct pt_regs *regs);
+static void	net_rx(struct net_device *dev);
+static int	net_close(struct net_device *dev);
+static struct	net_device_stats *net_get_stats(struct net_device *dev);
+static void	set_multicast_list(struct net_device *dev);
+static void     net_tx_timeout(struct net_device *dev);
+
+
+/* Example routines you must write ;->. */
+#define tx_done(dev) 1
+static void	hardware_send_packet(short ioaddr, char *buf, int length);
+static void 	chipset_init(struct net_device *dev, int startp);
+
+/*
+ * Check for a network adaptor of this type, and return '0' iff one exists.
+ * If dev->base_addr == 0, probe all likely locations.
+ * If dev->base_addr == 1, always return failure.
+ * If dev->base_addr == 2, allocate space for the device and return success
+ * (detachable devices only).
+ */
+static int __init do_netcard_probe(struct net_device *dev)
+{
+	int i;
+	int base_addr = dev->base_addr;
+	int irq = dev->irq;
+
+	SET_MODULE_OWNER(dev);
+
+	if (base_addr > 0x1ff)    /* Check a single specified location. */
+		return netcard_probe1(dev, base_addr);
+	else if (base_addr != 0)  /* Don't probe at all. */
+		return -ENXIO;
+
+	for (i = 0; netcard_portlist[i]; i++) {
+		int ioaddr = netcard_portlist[i];
+		if (netcard_probe1(dev, ioaddr) == 0)
+			return 0;
+		dev->irq = irq;
+	}
+
+	return -ENODEV;
+}
+ 
+static void cleanup_card(struct net_device *dev)
+{
+#ifdef jumpered_dma
+	free_dma(dev->dma);
+#endif
+#ifdef jumpered_interrupts
+	free_irq(dev->irq, dev);
+#endif
+	release_region(dev->base_addr, NETCARD_IO_EXTENT);
+}
+
+#ifndef MODULE
+struct net_device * __init netcard_probe(int unit)
+{
+	struct net_device *dev = alloc_etherdev(sizeof(struct net_local));
+	int err;
+
+	if (!dev)
+		return ERR_PTR(-ENOMEM);
+
+	sprintf(dev->name, "eth%d", unit);
+	netdev_boot_setup_check(dev);
+
+	err = do_netcard_probe(dev);
+	if (err)
+		goto out;
+	err = register_netdev(dev);
+	if (err)
+		goto out1;
+	return dev;
+out1:
+	cleanup_card(dev);
+out:
+	free_netdev(dev);
+	return ERR_PTR(err);
+}
+#endif
+
+/*
+ * This is the real probe routine. Linux has a history of friendly device
+ * probes on the ISA bus. A good device probes avoids doing writes, and
+ * verifies that the correct device exists and functions.
+ */
+static int __init netcard_probe1(struct net_device *dev, int ioaddr)
+{
+	struct net_local *np;
+	static unsigned version_printed;
+	int i;
+	int err = -ENODEV;
+
+	/* Grab the region so that no one else tries to probe our ioports. */
+	if (!request_region(ioaddr, NETCARD_IO_EXTENT, cardname))
+		return -EBUSY;
+
+	/*
+	 * For ethernet adaptors the first three octets of the station address 
+	 * contains the manufacturer's unique code. That might be a good probe
+	 * method. Ideally you would add additional checks.
+	 */ 
+	if (inb(ioaddr + 0) != SA_ADDR0
+		||	 inb(ioaddr + 1) != SA_ADDR1
+		||	 inb(ioaddr + 2) != SA_ADDR2)
+		goto out;
+
+	if (net_debug  &&  version_printed++ == 0)
+		printk(KERN_DEBUG "%s", version);
+
+	printk(KERN_INFO "%s: %s found at %#3x, ", dev->name, cardname, ioaddr);
+
+	/* Fill in the 'dev' fields. */
+	dev->base_addr = ioaddr;
+
+	/* Retrieve and print the ethernet address. */
+	for (i = 0; i < 6; i++)
+		printk(" %2.2x", dev->dev_addr[i] = inb(ioaddr + i));
+
+	err = -EAGAIN;
+#ifdef jumpered_interrupts
+	/*
+	 * If this board has jumpered interrupts, allocate the interrupt
+	 * vector now. There is no point in waiting since no other device
+	 * can use the interrupt, and this marks the irq as busy. Jumpered
+	 * interrupts are typically not reported by the boards, and we must
+	 * used autoIRQ to find them.
+	 */
+
+	if (dev->irq == -1)
+		;	/* Do nothing: a user-level program will set it. */
+	else if (dev->irq < 2) {	/* "Auto-IRQ" */
+		unsigned long irq_mask = probe_irq_on();
+		/* Trigger an interrupt here. */
+
+		dev->irq = probe_irq_off(irq_mask);
+		if (net_debug >= 2)
+			printk(" autoirq is %d", dev->irq);
+	} else if (dev->irq == 2)
+		/*
+		 * Fixup for users that don't know that IRQ 2 is really
+		 * IRQ9, or don't know which one to set.
+		 */
+		dev->irq = 9;
+
+	{
+		int irqval = request_irq(dev->irq, &net_interrupt, 0, cardname, dev);
+		if (irqval) {
+			printk("%s: unable to get IRQ %d (irqval=%d).\n",
+				   dev->name, dev->irq, irqval);
+			goto out;
+		}
+	}
+#endif	/* jumpered interrupt */
+#ifdef jumpered_dma
+	/*
+	 * If we use a jumpered DMA channel, that should be probed for and
+	 * allocated here as well. See lance.c for an example.
+	 */
+	if (dev->dma == 0) {
+		if (request_dma(dev->dma, cardname)) {
+			printk("DMA %d allocation failed.\n", dev->dma);
+			goto out1;
+		} else
+			printk(", assigned DMA %d.\n", dev->dma);
+	} else {
+		short dma_status, new_dma_status;
+
+		/* Read the DMA channel status registers. */
+		dma_status = ((inb(DMA1_STAT_REG) >> 4) & 0x0f) |
+			(inb(DMA2_STAT_REG) & 0xf0);
+		/* Trigger a DMA request, perhaps pause a bit. */
+		outw(0x1234, ioaddr + 8);
+		/* Re-read the DMA status registers. */
+		new_dma_status = ((inb(DMA1_STAT_REG) >> 4) & 0x0f) |
+			(inb(DMA2_STAT_REG) & 0xf0);
+		/*
+		 * Eliminate the old and floating requests,
+		 * and DMA4 the cascade.
+		 */
+		new_dma_status ^= dma_status;
+		new_dma_status &= ~0x10;
+		for (i = 7; i > 0; i--)
+			if (test_bit(i, &new_dma_status)) {
+				dev->dma = i;
+				break;
+			}
+		if (i <= 0) {
+			printk("DMA probe failed.\n");
+			goto out1;
+		} 
+		if (request_dma(dev->dma, cardname)) {
+			printk("probed DMA %d allocation failed.\n", dev->dma);
+			goto out1;
+		}
+	}
+#endif	/* jumpered DMA */
+
+	np = netdev_priv(dev);
+	spin_lock_init(&np->lock);
+
+	dev->open		= net_open;
+	dev->stop		= net_close;
+	dev->hard_start_xmit	= net_send_packet;
+	dev->get_stats		= net_get_stats;
+	dev->set_multicast_list = &set_multicast_list;
+
+        dev->tx_timeout		= &net_tx_timeout;
+        dev->watchdog_timeo	= MY_TX_TIMEOUT; 
+	return 0;
+out1:
+#ifdef jumpered_interrupts
+	free_irq(dev->irq, dev);
+#endif
+out:
+	release_region(base_addr, NETCARD_IO_EXTENT);
+	return err;
+}
+
+static void net_tx_timeout(struct net_device *dev)
+{
+	struct net_local *np = netdev_priv(dev);
+
+	printk(KERN_WARNING "%s: transmit timed out, %s?\n", dev->name,
+	       tx_done(dev) ? "IRQ conflict" : "network cable problem");
+
+	/* Try to restart the adaptor. */
+	chipset_init(dev, 1);
+
+	np->stats.tx_errors++;
+
+	/* If we have space available to accept new transmit
+	 * requests, wake up the queueing layer.  This would
+	 * be the case if the chipset_init() call above just
+	 * flushes out the tx queue and empties it.
+	 *
+	 * If instead, the tx queue is retained then the
+	 * netif_wake_queue() call should be placed in the
+	 * TX completion interrupt handler of the driver instead
+	 * of here.
+	 */
+	if (!tx_full(dev))
+		netif_wake_queue(dev);
+}
+
+/*
+ * Open/initialize the board. This is called (in the current kernel)
+ * sometime after booting when the 'ifconfig' program is run.
+ *
+ * This routine should set everything up anew at each open, even
+ * registers that "should" only need to be set once at boot, so that
+ * there is non-reboot way to recover if something goes wrong.
+ */
+static int
+net_open(struct net_device *dev)
+{
+	struct net_local *np = netdev_priv(dev);
+	int ioaddr = dev->base_addr;
+	/*
+	 * This is used if the interrupt line can turned off (shared).
+	 * See 3c503.c for an example of selecting the IRQ at config-time.
+	 */
+	if (request_irq(dev->irq, &net_interrupt, 0, cardname, dev)) {
+		return -EAGAIN;
+	}
+	/*
+	 * Always allocate the DMA channel after the IRQ,
+	 * and clean up on failure.
+	 */
+	if (request_dma(dev->dma, cardname)) {
+		free_irq(dev->irq, dev);
+		return -EAGAIN;
+	}
+
+	/* Reset the hardware here. Don't forget to set the station address. */
+	chipset_init(dev, 1);
+	outb(0x00, ioaddr);
+	np->open_time = jiffies;
+
+	/* We are now ready to accept transmit requeusts from
+	 * the queueing layer of the networking.
+	 */
+	netif_start_queue(dev);
+
+	return 0;
+}
+
+/* This will only be invoked if your driver is _not_ in XOFF state.
+ * What this means is that you need not check it, and that this
+ * invariant will hold if you make sure that the netif_*_queue()
+ * calls are done at the proper times.
+ */
+static int net_send_packet(struct sk_buff *skb, struct net_device *dev)
+{
+	struct net_local *np = netdev_priv(dev);
+	int ioaddr = dev->base_addr;
+	short length = ETH_ZLEN < skb->len ? skb->len : ETH_ZLEN;
+	unsigned char *buf = skb->data;
+
+	/* If some error occurs while trying to transmit this
+	 * packet, you should return '1' from this function.
+	 * In such a case you _may not_ do anything to the
+	 * SKB, it is still owned by the network queueing
+	 * layer when an error is returned.  This means you
+	 * may not modify any SKB fields, you may not free
+	 * the SKB, etc.
+	 */
+
+#if TX_RING
+	/* This is the most common case for modern hardware.
+	 * The spinlock protects this code from the TX complete
+	 * hardware interrupt handler.  Queue flow control is
+	 * thus managed under this lock as well.
+	 */
+	spin_lock_irq(&np->lock);
+
+	add_to_tx_ring(np, skb, length);
+	dev->trans_start = jiffies;
+
+	/* If we just used up the very last entry in the
+	 * TX ring on this device, tell the queueing
+	 * layer to send no more.
+	 */
+	if (tx_full(dev))
+		netif_stop_queue(dev);
+
+	/* When the TX completion hw interrupt arrives, this
+	 * is when the transmit statistics are updated.
+	 */
+
+	spin_unlock_irq(&np->lock);
+#else
+	/* This is the case for older hardware which takes
+	 * a single transmit buffer at a time, and it is
+	 * just written to the device via PIO.
+	 *
+	 * No spin locking is needed since there is no TX complete
+	 * event.  If by chance your card does have a TX complete
+	 * hardware IRQ then you may need to utilize np->lock here.
+	 */
+	hardware_send_packet(ioaddr, buf, length);
+	np->stats.tx_bytes += skb->len;
+
+	dev->trans_start = jiffies;
+
+	/* You might need to clean up and record Tx statistics here. */
+	if (inw(ioaddr) == /*RU*/81)
+		np->stats.tx_aborted_errors++;
+	dev_kfree_skb (skb);
+#endif
+
+	return 0;
+}
+
+#if TX_RING
+/* This handles TX complete events posted by the device
+ * via interrupts.
+ */
+void net_tx(struct net_device *dev)
+{
+	struct net_local *np = netdev_priv(dev);
+	int entry;
+
+	/* This protects us from concurrent execution of
+	 * our dev->hard_start_xmit function above.
+	 */
+	spin_lock(&np->lock);
+
+	entry = np->tx_old;
+	while (tx_entry_is_sent(np, entry)) {
+		struct sk_buff *skb = np->skbs[entry];
+
+		np->stats.tx_bytes += skb->len;
+		dev_kfree_skb_irq (skb);
+
+		entry = next_tx_entry(np, entry);
+	}
+	np->tx_old = entry;
+
+	/* If we had stopped the queue due to a "tx full"
+	 * condition, and space has now been made available,
+	 * wake up the queue.
+	 */
+	if (netif_queue_stopped(dev) && ! tx_full(dev))
+		netif_wake_queue(dev);
+
+	spin_unlock(&np->lock);
+}
+#endif
+
+/*
+ * The typical workload of the driver:
+ * Handle the network interface interrupts.
+ */
+static irqreturn_t net_interrupt(int irq, void *dev_id, struct pt_regs * regs)
+{
+	struct net_device *dev = dev_id;
+	struct net_local *np;
+	int ioaddr, status;
+	int handled = 0;
+
+	ioaddr = dev->base_addr;
+
+	np = netdev_priv(dev);
+	status = inw(ioaddr + 0);
+
+	if (status == 0)
+		goto out;
+	handled = 1;
+
+	if (status & RX_INTR) {
+		/* Got a packet(s). */
+		net_rx(dev);
+	}
+#if TX_RING
+	if (status & TX_INTR) {
+		/* Transmit complete. */
+		net_tx(dev);
+		np->stats.tx_packets++;
+		netif_wake_queue(dev);
+	}
+#endif
+	if (status & COUNTERS_INTR) {
+		/* Increment the appropriate 'localstats' field. */
+		np->stats.tx_window_errors++;
+	}
+out:
+	return IRQ_RETVAL(handled);
+}
+
+/* We have a good packet(s), get it/them out of the buffers. */
+static void
+net_rx(struct net_device *dev)
+{
+	struct net_local *lp = netdev_priv(dev);
+	int ioaddr = dev->base_addr;
+	int boguscount = 10;
+
+	do {
+		int status = inw(ioaddr);
+		int pkt_len = inw(ioaddr);
+	  
+		if (pkt_len == 0)		/* Read all the frames? */
+			break;			/* Done for now */
+
+		if (status & 0x40) {	/* There was an error. */
+			lp->stats.rx_errors++;
+			if (status & 0x20) lp->stats.rx_frame_errors++;
+			if (status & 0x10) lp->stats.rx_over_errors++;
+			if (status & 0x08) lp->stats.rx_crc_errors++;
+			if (status & 0x04) lp->stats.rx_fifo_errors++;
+		} else {
+			/* Malloc up new buffer. */
+			struct sk_buff *skb;
+
+			lp->stats.rx_bytes+=pkt_len;
+			
+			skb = dev_alloc_skb(pkt_len);
+			if (skb == NULL) {
+				printk(KERN_NOTICE "%s: Memory squeeze, dropping packet.\n",
+					   dev->name);
+				lp->stats.rx_dropped++;
+				break;
+			}
+			skb->dev = dev;
+
+			/* 'skb->data' points to the start of sk_buff data area. */
+			memcpy(skb_put(skb,pkt_len), (void*)dev->rmem_start,
+				   pkt_len);
+			/* or */
+			insw(ioaddr, skb->data, (pkt_len + 1) >> 1);
+
+			netif_rx(skb);
+			dev->last_rx = jiffies;
+			lp->stats.rx_packets++;
+			lp->stats.rx_bytes += pkt_len;
+		}
+	} while (--boguscount);
+
+	return;
+}
+
+/* The inverse routine to net_open(). */
+static int
+net_close(struct net_device *dev)
+{
+	struct net_local *lp = netdev_priv(dev);
+	int ioaddr = dev->base_addr;
+
+	lp->open_time = 0;
+
+	netif_stop_queue(dev);
+
+	/* Flush the Tx and disable Rx here. */
+
+	disable_dma(dev->dma);
+
+	/* If not IRQ or DMA jumpered, free up the line. */
+	outw(0x00, ioaddr+0);	/* Release the physical interrupt line. */
+
+	free_irq(dev->irq, dev);
+	free_dma(dev->dma);
+
+	/* Update the statistics here. */
+
+	return 0;
+
+}
+
+/*
+ * Get the current statistics.
+ * This may be called with the card open or closed.
+ */
+static struct net_device_stats *net_get_stats(struct net_device *dev)
+{
+	struct net_local *lp = netdev_priv(dev);
+	short ioaddr = dev->base_addr;
+
+	/* Update the statistics from the device registers. */
+	lp->stats.rx_missed_errors = inw(ioaddr+1);
+	return &lp->stats;
+}
+
+/*
+ * Set or clear the multicast filter for this adaptor.
+ * num_addrs == -1	Promiscuous mode, receive all packets
+ * num_addrs == 0	Normal mode, clear multicast list
+ * num_addrs > 0	Multicast mode, receive normal and MC packets,
+ *			and do best-effort filtering.
+ */
+static void
+set_multicast_list(struct net_device *dev)
+{
+	short ioaddr = dev->base_addr;
+	if (dev->flags&IFF_PROMISC)
+	{
+		/* Enable promiscuous mode */
+		outw(MULTICAST|PROMISC, ioaddr);
+	}
+	else if((dev->flags&IFF_ALLMULTI) || dev->mc_count > HW_MAX_ADDRS)
+	{
+		/* Disable promiscuous mode, use normal mode. */
+		hardware_set_filter(NULL);
+
+		outw(MULTICAST, ioaddr);
+	}
+	else if(dev->mc_count)
+	{
+		/* Walk the address list, and load the filter */
+		hardware_set_filter(dev->mc_list);
+
+		outw(MULTICAST, ioaddr);
+	}
+	else 
+		outw(0, ioaddr);
+}
+
+#ifdef MODULE
+
+static struct net_device *this_device;
+static int io = 0x300;
+static int irq;
+static int dma;
+static int mem;
+MODULE_LICENSE("GPL");
+
+int init_module(void)
+{
+	struct net_device *dev;
+	int result;
+
+	if (io == 0)
+		printk(KERN_WARNING "%s: You shouldn't use auto-probing with insmod!\n",
+			   cardname);
+	dev = alloc_etherdev(sizeof(struct net_local));
+	if (!dev)
+		return -ENOMEM;
+
+	/* Copy the parameters from insmod into the device structure. */
+	dev->base_addr = io;
+	dev->irq       = irq;
+	dev->dma       = dma;
+	dev->mem_start = mem;
+	if (do_netcard_probe(dev) == 0) {
+		if (register_netdev(dev) == 0)
+			this_device = dev;
+			return 0;
+		}
+		cleanup_card(dev);
+	}
+	free_netdev(dev);
+	return -ENXIO;
+}
+
+void
+cleanup_module(void)
+{
+	unregister_netdev(this_device);
+	cleanup_card(this_device);
+	free_netdev(this_device);
+}
+
+#endif /* MODULE */
+
+/*
+ * Local variables:
+ *  compile-command:
+ *	gcc -D__KERNEL__ -Wall -Wstrict-prototypes -Wwrite-strings
+ *	-Wredundant-decls -O2 -m486 -c skeleton.c
+ *  version-control: t
+ *  kept-new-versions: 5
+ *  tab-width: 4
+ *  c-indent-level: 4
+ * End:
+ */